Regulatory Capital (Details)		12 Months Ended
Jan. 01, 2019	Dec. 31, 2017	Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage ratio: Actual Ratio		9.37%	9.73%
CET1: Actual Ratio		10.81%	11.49%
Tier I risk-based capital ratio: Actual Ratio		11.75%	12.58%
Total risk--based capital ratio: Actual Ratio		12.87%	13.84%
Leverage ratio: For Capital Adequacy Purposes Ratio		4.00%	4.00%
CET1: For Capital Adequacy Purposes Ratio		5.75%	5.125%
Tier I risk-based capital ratio: For Capital Adequacy Purposes Ratio		7.25%	6.625%
Total risk-based capital ratio: For Capital Adequacy Purposes Ratio		9.25%	8.625%
Capital conservation buffer		1.25%	0.0625%
Scenario, Forecast
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage ratio: For Capital Adequacy Purposes Ratio	4.00%
CET1: For Capital Adequacy Purposes Ratio	7.00%
Tier I risk-based capital ratio: For Capital Adequacy Purposes Ratio	8.50%
Total risk-based capital ratio: For Capital Adequacy Purposes Ratio	10.50%
Capital conservation buffer	2.50%
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage ratio: Actual Ratio		9.03%	9.50%
CET1: Actual Ratio		11.33%	12.23%
Tier I risk-based capital ratio: Actual Ratio		11.33%	12.23%
Total risk--based capital ratio: Actual Ratio		12.50%	13.48%
Leverage ratio: To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio		5.00%	5.00%
CET1: To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio		6.50%	6.50%
Tier I risk-based capital ratio: To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio		8.00%	8.00%
Total risk-based capital ratio: To Be Well-Capitalized Under Prompt Corrective Action Provisions Ratio		10.00%	10.00%

Capital Conservation Buffer

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Common Equity Tier One Capital Required To Be Well Capitalized To Risk Weighted Assets

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Common Equity Tier One Capital To Risk Weighted Assets

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Percentage of Common Equity Tier One Risk-based Capital to total risk-weighted assets, as defined by regulatory framework.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital divided by average assets as defined in the regulations.

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The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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